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| #include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#define BUFFER_SIZE 1024
int main(int argc, char* argv[])
{
if (argc <= 3)
{
printf("usage: %s ip_address port_number receive_buffer_size\n", basename(argv[0]));
return 1;
}
const char* ip = argv[1];
int port = atoi(argv[2]);
struct sockaddr_in address = {0};
address.sin_family = AF_INET;
inet_pton(AF_INET, ip, &address.sin_addr);
address.sin_port = htons(port);
int sock = socket(PF_INET, SOCK_STREAM, 0);
assert(sock >= 0);
int recvbuf = atoi(argv[3]);
int len = sizeof(recvbuf);
setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &recvbuf, sizeof(recvbuf));
getsockopt(sock, SOL_SOCKET, SO_RCVBUF, &recvbuf, (socklen_t*)&len);
printf("the receive buffer size after settting is %d\n", recvbuf);
int ret = bind(sock, (struct sockaddr*)&address, sizeof(address));
assert(ret != -1);
ret = listen(sock, 5);
assert(ret != -1);
struct sockaddr_in client;
socklen_t client_addrlength = sizeof(client);
int connfd = accept(sock, (struct sockaddr*)&client, &client_addrlength);
if (connfd < 0)
{
printf("errno is: %d\n", errno);
}
else
{
char buffer[BUFFER_SIZE];
memset(buffer, '\0', BUFFER_SIZE);
while (recv(connfd, buffer, BUFFER_SIZE - 1, 0) > 0) {}
close(connfd);
}
close(sock);
return 0;
}
|